pt-online-schema-change performs online, non-blocking schema changes to a table.
The table to change must be specified in the DSN C<t> part, like C<t=my_table>.
The table can be database-qualified, or the database can be specified with the
L<"--database"> option. For more details, please use the --help option, or try
'perldoc /usr/bin/pt-online-schema-change' for complete documentation.

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From the manual, I believe you mean the option --drop-old-table.

There is a second example in the manual which presumably will also fail: